Injector



E. BLAUHORN.

INJECTOR.

APPuc/mon msn nc.23. 1920.

Patented Feb. 7, 1922.

UNITED STATES PATENT OFFICE.

4EMANUEIT BLAUHORN', 0F VIENNA, AUSTRIA,r ASSIGNOR TO THE FIRM 0F ALEX.

FRIEDMANN, 0F VIENNA., AUSTRIA. j

INJECTOR Specication f Letters Patent.

Patented Feb. 7, 41922.

.Application led December 23, 1920. Serial No. 432,817.

To @ZZ/whom it may concern:

Be it known that I, EMANUEL BLAUHoR-N, engineer, a citizen of theRepublic kof Austria, residing at Vienna Austria, have invented certainnew and useful Improvements in an Injector, of which the following is aspecilcation.

In an injector suitable for feeding a boiler and in which the opposingpressure is greater than the steam pressure, the smallest cross sectionof the nozzle is at the part of the delivery nozzle'which is turnedtowards the steam inlet. At this part the water jet has the greatestvelocity and a pressure which approximates atmospheric. In the deliverynozzle itself the velocity energy is changed into pressure energy andthe highest pressure is yattained at the end of the delivery nozzle.

Measurements of the pressure relations. in the delivery nozzle show.that the pressure rapidly rises in the first half of the nozzleaccording to a hyperbolic law and then more slowly attains the maximumor {inal pressure.

If the length of the delivery nozzle measured from the smallest crosssection to the outlet is l5 times the diameter of the smallest crosssection, a proportion which is usually main` tained when noconstructional'limits are set to the length of the injector, thepressure in the first half of the delivery nozzle is about threequarters of the maximum pressure.

Experiments on the pressure relations in the delivery nozzle also showthat the pressures, probably in consequence of eddies, are very unequaldirectly adjacent that part of the nozzle which is of the smallest crosssection and on that side of said part which lies toward the delivery endso that shocks rapidly succeeding one another occur which graduallybecome less towards the end of the nozzle. These shocks are detrimentalto the working of the injector since apparatus with short deliverynozzles can work without overflow loss only within narrow limits of thesteam pressure. But even in delivery nozzles having the normal lengththe apparatus works better if the shocks can be lessened in the firsthalf ofv the pressure nozzle. This advantage is obtained by the presentinvention, which consists essentially in the provisionvof a space whichis connected with the interior of the dellvery nozzle andis otherwisecompletely closed. It is preferable that the connection with thedelivery nozzle should be made at a Vpoint located at-less than onevhalf the distance between that part of the nozzle which is of smallestcross-section and the delivery ing cone, 3 the delivery nozzle of theinjector, 4 is a. s enclosing the nozzle 3 and connected wlth theinterior of the nozzle by an annular opening 5. Instead of the annularconnecting opening 5 a series of perforations or channels might beprovided. The space 4 acts during the operation of the injector as anair chamber which takes up the shocks within the delivery nozzle,especially where they are most violent.

The injector, consequently, feeds within certain limits more smoothlythan it would without the space 4.

1. An injector of the type. embodying a delivery nozzle of the taperedform having a chamber in communication with the interlor of the deliverynozzle.

2. An injector according to claim l in which the chamber communicateswith the delivery nozzle within the Vfirst half of the length of thelnozzle measures from the smaller end.

3. An injector according to claim 1 wherein the chamber surrounds thenozzle and communicates with the nozzle at a point nearer that partthereof which isof smallest cross-section than .to that part thereofwhich is of largest cross-section.

4. An injector accordin to claim l wherein the chamber commumcates withthe interior of the delivery nozzle. at a point lom hand.

y EMANUEL BLAUHORN.

